What is the release date for the AT&T Nokia (Lumia) 1520 Windows 10?

i noticed that some on here say they already have windows 10 on their 1520. where did you get it? i would love to upgrade my 1520 to Win10. i got my 1520 from att and i own it. i can get it unlocked if that is required to install win10.

Windows 10 mobile is still in development. You can join the Insider's program to get development releases of Windows 10 on your phone. Check out all the information here, at the Windows Central hub for Insider's Program.Windows Insider (Phone) | Windows Central

I would wait, win 10 is to buggy even on tablets and PC's... I'm waiting for the most stable version to come out and install on my L1520... upgraded to win10 on my SP3 and had to roll back within a week because it mucked up my SP3! and even when I rolled back to 8.1 it mucked up that too!